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1b1ed1a
(Get the code!)
This is going to be hard to resolve. Ḿost of the time is caused by an incorrect dsdt table generated by the kernel, mostly because to bad programmed bios, or bios too focused on microsoft windows.
In my case, as i posted, the l1310g fujitsu amilo has it and could resolved it loading a fixed dsdt table.
So first, try to see if you have an updated bios for your motherboard/laptop. If not, you'll have to add it manually (maybe in 2.6.27 is resolved, or will be on 2.6.28.... i don't know how the kernel is programmed on this, or how is treated to fix that way to handle the generation of the dsdt table, to be fixed because of this).
Google it to see if someone fixed the table for your motherboard/laptop, and, btw, if you fill a wiki page about it on wiki.ubuntu.com you'll help the others to resolve it ;-)